Series / The X-Files
aka: The X-Files

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I want to believe.

The truth is out there.

The X-Files is an American TV series created by Chris Carter. It ran nine seasons (1993-2002) and two movies (Fight the Future, which was The Movie, in 1998 and I Want to Believe in 2008). 2016 saw a limited revival in the form of six episode 10th season, which in 2018 will be continued with a longer 11th season running ten episodes.

FBI physician Dr. Dana Scully (Gillian Anderson) is assigned the task of keeping tabs on Agent Fox Mulder (David Duchovny), a talented detective whose obsession with the paranormal is of grave concern to his superiors. Working out of the Hoover Building basement, Mulder specializes in the Bureau's "X-Files": a collection of cold cases deemed unsolvable due to macabre or taboo elements. While Mulder attributes these elements to the supernatural and extraterrestrial, Scully is a skeptic who attempts to debunk his theories through scientific reasoning. Together they investigate all manner of strange and unusual cases, which over time hint at a massive government conspiracy linked to a series of alien abductions going as far back as the forties.

The show's writers, among them Carter and future Breaking Bad showrunner Vince Gilligan, were celebrated for their innovative mix of cop-show conventions, Moonlighting style romance, urban legends, new age mysticism, government conspiracies, action, wry humor and genuinely scary moments. The show's high production values and sharp writing helped it reach beyond the niche Twin Peaks crowd to make it one of the most popular and acclaimed shows on television and a bona fide worldwide cultural phenomenon. It was one of the earliest shows to be released in box sets (albeit on home video with inflated price tags) with behind-the-scenes goodies. These VHS sets became a common sight in supermarkets and rental stores, which fueled viewership even more.

Although it genuinely was good in its own right, the series arrived at the right time for that to happen; mainstream interest in ufology and related topics peaked in around 1998. These days however, E.T. doesn't get quite as much airtime as he used to outside of fringe circles, and as a result, The X-Files as a series is a lot less culturally relevant now than it was during production.

Episodes alternate between standalone Monster of the Week episodes and a complex, unfolding Myth Arc confirming pretty much every terrifying "conspiracy" of the past forty years (and even predicting a few new ones): there was a second gunman, the Cold War is a sham, the government is in cahoots with various factions of aliens, and we're all slaves to the machinations of sinister (and worse — borderline incompetent) old men in smoke-filled back rooms. A quarter to a third of each season figures into Mulder's ever-growing investigation, though it was put on hold in 1997 to avoid conflicts with Fight the Future (then in post-production), resulting in the Denser and Wackier Season Five. Several of the show's most acclaimed comedic episodes were aired during this period. The final season was supposed to be followed by a series of movies that would eventually resolve the ongoing plot, but the first post-series movie did not touch on the conspiracy plotline and met with lukewarm success. The show received a short-lived spinoff, The Lone Gunmen.

The future of The X-Files and its Myth Arc remained uncertain for a long time while die-hard fans kept expecting a third film that would either close-up the mystery or revive the franchise. In March 2013, IDW announced that they would continuing the series as a comic book. The comic book, marked as the tenth season, came out in July 2013 and picks up after the events of the second movie. And now it has a trope page!

A six episode miniseries, with the involvement of Carter, Duchovny and Anderson began airing January 25th 2016, and feature a split of mythology and Monster of the Week episodes. Former writers/producers James Wong, Darin Morgan, and Glen Morgan contributed to the revival, and composer Mark Snow will also return. The first full-length trailer can be viewed here. Another series has been confirmed.The show has a Best Episode Crowner and many sub-pages like a character sheet or recaps.

"Cold Cases", an series of Audio Adaptation episodes of of the season 10 comic books with revisits to past cases such as the Flukeman, was released on Audible on July 18, 2017, featuring the voice talents of Duchovny, Anderson, Mitch Pileggi, and more. It does not correspond to the season 10 TV miniseries continuity.

A webcomic recapping all the episodes has been started by Shaenon K. Garrity.and a blog devoted to revewing the entire series was started by a writer for The Mary Sue.


The X-Files and its Myth Arc provide examples of the following tropes:

    open/close all folders 

    A-G 
  • Aborted Arc:
    • At the end of the first movie, Scully talks about the vaccine that saved her, saying that it could cure people from the alien virus. It could also seriously mess up with the upcoming alien invasion. Sigh, the agents decided to pursue other things.
      • This comes back in the Season 10 revival, when Scully realizes the alien DNA introduced into her system through the vaccine might in-turn create a vaccine that can save Mulder and the rest of humanity that are beginning to succumb to a planned global epidemic.
    • During Season 6-7 the Syndicate was destroyed at the hands of the Alien Rebels. At the time, the writers spoke of their plans for a new Syndicate, headed by Alex Krycek and Marita Covarrubias. This plotline was set up in "Requiem" but never resurfaced.
  • Adventure Towns: The Dynamic Duo chases aliens, alien-human hybrids, clones, genetic mutants, vampires, serial killers or conspirators and encounters weird phenomena all over the United States. Plus in Norway, Hong Kong, Russia and Antarctica.
  • Affectionate Gesture to the Head: Mulder and Scully would touch each other's forehead, stroke each other's hair, hold each other's head or cup each other's face. UST at its best.
  • Agents Mulder and Scully: The Trope Namers no less.
  • Alien Abduction: A common theme, although it's usually ambiguous whether extraterrestrials or human conspirators are actually responsible for it. Both Scully and Mulder were victims of it, among many others.
  • Aliens Are Bastards: The Greys fit this to a t. They didn't used to be like this, and were once very peaceful beings, but the Black Oil corrupted and twisted them like it does all other life.
  • Alien Autopsy:
    • We see a doctor take away a murdered alien body from the site of the Rosewell crash in the Season 10 revival. The tech obtained from his dissection of the alien later on has far-ranging consequences.
  • The Alleged Boss: Walter Skinner is type 3. He eventually gets replaced due to his inability to make Mulder and Scully obey him. Alvin Kersh, the new boss, would be the same type, since it's not like Mulder, Scully and/or Dogget and Reyes listen to him any better, except for the fact that he plays dirty and has better connections within the Bureau than Skinner.
  • All Theories Are True
  • Alternative Foreign Theme Song: The Japanese version has a few ending themes, including "Love Phantom" by B'z, "Unbalanced" by Maki Oguro, and "True Navigation" by Two-Mix.
  • Always Save the Girl: In the very first episode, Mulder said that nothing else mattered to him except finding out the truth about the conspiracy and what happened to his sister. Early seasons of the show got a lot of mileage out of making him choose between pursuing his quest and saving Scully. Around the beginning of season 5, though, it pretty much ceased to even be an issue — he decided Scully was priority #1 and never looked back. (She saves his butt just as often, of course.)
  • Anchored Ship: For the first five seasons.
  • Alternate Continuity: The IDW comic to the 2016 miniseries.
  • Anti-Villain: The Cigarette Smoking Man, some of the time.
  • Anyone Can Die: Starting with Deep Throat, and continuing throughout the rest of the show.
  • Anywhere but Their Lips: In several scenes throughout the series between Mulder and Scully, forehead kisses, kisses on the cheek, and a couple kisses on the hand.
  • Arbitrary Skepticism:
    • Scully remains a hardcore skeptic long after she's seen shape-shifting aliens, watched Mulder be mind-controlled into things he'd never do on his own, etc. It's somewhat justified, though: later seasons tended to imply that Scully felt she had to take a more skeptical stance than she really believed anymore in order to keep Mulder's wacky ideas grounded. That is until Mulder himself is abducted, at which point Scully is promoted to a full-on believer. But as of season 10, she's back to something much closer to her original role, making this a Zig-Zagging Trope.
    • Even Mulder refused to believe in anything that was close to miracles and religiously paranormal stuff (in these episodes it's Scully who's open-minded, due to her religious beliefs). In episode "3", Mulder doesn't believe in vampires, which of course turn out to exist.
  • Arc Words: "Trust no one", Deep Throat's last words which come up various times throughout the series.
  • Ascended Extra:
    • The Cigarette-Smoking Man had four brief, mostly wordless appearances in the first season, doing little beyond hover in the background smoking. His role gradually expanded, and by the middle of Season Two he was firmly established as the show's Big Bad.
    • There's Nicholas Lea, who parlayed a brief guest spot in Season One's "Genderbender" as a random character, before going into a major role as Alex Krycek in Season Two (a trope You Look Familiar). The character of Krycek is an ascended extra as he was originally conceived as a temporary partner for Mulder when Scully was missing, and the producers were going to kill him off if Lea didn't do a good enough job portraying him. He instead went on to appear in every subsequent season.
  • Badass Bookworm: An Oxford-educated psychologist and a forensic pathologist with a physics degree fight aliens (and all sorts of other things).
  • Badass Longcoat: Worn by most characters who look rather intimidating. The FBI wear them, the conspirators wear them, the mysterious informants wear them, everybody wears them! They all wear long trench coats or lab coats, and they all look awesome in them.
  • Bad Black Barf: An alien virus called "Black Oil" caused black liquid to come out of the mouth, nose and eyes of its victims.
  • Bad Dreams: Mulder frequently has nightmares about his sister's abduction; it's probably the biggest reason he's an insomniac.
    • Both Mulder and Scully have nightmares about the other during their separate abductions. For Scully, they come so often and regularly that she panics when she stops having them, fearing that Mulder's death is the reason.
  • The Bad Guy Wins: Well, the good guys don't, anyway. Sure, CSM and Rohrer are both dead and Mulder has escaped. However, many of the conspirators are still alive, our heroes have been forced into a life on the run, they have just discovered the date of a planned alien invasion and are no closer to stopping the alien takeover than they were at the beginning of the pilot.
  • Bag of Holding: Mulder's and Scully's pockets. Boy, do they have to be deep and spacious! They have there their FBI badges, mobile phones, wallet/purse, calling cards, coins, keys, pens, latex gloves, bags for collecting evidence, flash-lights of various sizes, and Mulder occasionally pulls sunflower seeds out of there.
  • Bat Signal: Mulder summons his informants by switching on a blue light lamp in his apartment (Deep Throat) and by putting the iconic X sign from masking tape on the window pane (Mr. X). Marita gave him his phone number, though.
  • Bee Afraid: The Government Conspiracy uses bees as a vector for spreading The Virus.
  • Berserk Button: Do not come between Mulder and Scully. No, really. It's a bad idea. That goes for both of them, by the way.
  • The Big Board: The X-Files office has bulletin boards and walls covered with pictures, photos and newspaper clippings concerning the paranormal and the cases Mulder and Scully were working on. In addition, they often used slide shows to present cases. Considering Mulder's interest in the paranormal and the level of his obsession, some might consider his office to be a Room Full of Crazy.
  • Bittersweet Ending: At the end of the show, the Government Conspiracy has taken some hits but is still going strong, and alien colonization of Earth is supposedly inevitable and proceeding on schedule for 2012. Mulder and Scully are on the run from a death sentence... but they're both alive, and they're together, and that means maybe there's hope.
  • Black Eyes of Evil: They mean you've been infected with the Black Oil, some kind of alien virus... thing.
  • Black Helicopter
  • Black Speech: Whenever you hear German, Japanese or Russian, the chances are they are spoken by evil conspirators, and dark post-world-war-two and post-cold-war undertones are implied.
  • Bland-Name Product: "Morley Cigarettes", the Cigarette Smoking Man's brand of choice — although this isn't the first show on American TV to use Morleys.
  • The Blank: The Alien Rebels have no faces, having sealed every orifice on their bodies to prevent infection by the Black Oil.
  • Blessed with Suck / Cursed with Awesome: Tends to be the case whenever the Monster of the Week is human.
  • Bloody Murder: Alien-human hybrids with acidic blood.
  • Body Horror: All the time, especially in the Myth Arc episodes.
  • Bond Villain Stupidity: The Conspiracy has opportunity to kill Mulder, but never does.
  • Breather Episode: The comic relief episodes actually provided some of the more interesting and innovative filler and served to counterbalance some of the more ridiculous serious episodes as the series went on.
  • Candlelit Bath: Scully likes them.
  • Captain's Log: Early seasons had Scully (and sometimes Mulder) writing case reports at the end of many of the Monster of the Week episodes. In the final seasons, after David Duchovny left the show, Scully read her journal entries as letters to the missing Mulder.
  • Chekhov M.I.A.: Mulder's sister. She did get used eventually.
  • Chest Burster
  • Chilly Reception: Mulder toward Scully initially; later, either of them towards anyone replacing the other (especially between Scully and Fowley).
  • Conspiracy Theorist: Loads of 'em, including Mulder and the Lone Gunmen.
    • At the beginning of the 2016 revival, Mulder & Scully meet Tad O'Malley, a conspiracy theorist in the vein of Alex Jones that helps drive the season's arc.
  • Contagious Cassandra Truth: Mulder usually had this problem after convincing Scully. Other characters they convinced also tended to suffer this trope (if they weren't blackmailed or bribed by the Ancient Conspiracy).
  • Continuity Lockout
  • Cool Old Guy: Arthur Dales
  • Creepy Child: Approximately one per season and several were a part of the Myth Arc stories.
  • Crisis of Faith: Scully started the show as a nonpracticing Catholic. Part of her Character Arc involved her coming to terms with her faith and deciding she could pray and attend church regularly even if she didn't always agree with everything The Church said.
  • Cryptid Episode: There are enough cryptid episodes to stuff the Berlin Zoo full with them.
  • Darker and Edgier: Seasons 4 and 8.
  • Deadly Doctor: Evil doctors collaborate with the conspiracy, having no scruples performing experiments on people.
  • Deadly Nosebleed: She doesn't actually die of it, but this is the only visible symptom when Scully has terminal cancer.
  • Deal with the Devil: We find that Monica Reyes has made a deal with Smoking Man to save herself from the triggered pandemic that occurs at the end of Season 10.
  • Death by Pragmatism: The Conspiracy, despite their best wishes.
  • Declaration of Protection: Mulder goes just a little nuts with the protection when Scully returns from being abducted in season two. He feels he failed to protect her from it, which is only compounded by the guilt he still feels over his sister's abduction years before. He ditches her when things get hairy, lies to her about where he's going so she won't follow him, and asks her to sit out cases for fear of her life. The only thing this does (besides piss Scully off—she's a trained FBI agent, after all) is show the bad guys that the only way to hurt him is to hurt her and it starts a vicious cycle of Scully being kidnapped, saved, and then Mulder being more protective.
  • Deus Angst Machina: The main characters get a disproportionate number of metaphorical Groin Kicks just within the few years in which the show takes place. Mulder has both parents die and is constantly tormented by people who appear to be his sister but aren't, but Scully takes the cake having one parent and her sister die (the sister being at least partly her fault) and the entire abduction plotline.
  • Did They or Didn't They?: Lots of teasing from late season seven on. Eventually it's confirmed that yes, they did.
  • Died Happily Ever After: The fate of Samantha Mulder.
  • Distressed Damsel / Distressed Dude: One of the first shows to have both male and female leads carry the Distress Ball more or less equally.
  • Do Not Adjust Your Set
  • Elective Mute
  • Elvis Lives: Mulder claims to believe this, but knowing Mulder he could be making fun of himself.
  • Emerging from the Shadows: A common occurrence.
  • The End... Or Is It?: Leading to Fridge Horror galore. At the end of many episodes the things Mulder and Scully investigate are still running rampant and could be doing who knows what.
  • Enemy Mine
  • Everyone Can See It
  • Exposed Extraterrestrials: Applies to most "Gray" aliens, except in the episode "The Unnatural," where the Gray is wearing a baseball uniform
  • Eyeless Face: The alien rebels have their eyes, ears and mouth sealed up so they can't be infested with the 'black oil'.
  • Eye Scream: The alien rebels sewn up eyes definitely count. Creepy as hell!
  • Facial Dialogue: Mulder and Scully are very good at this. Most conversations have a layer of embedded subtext just from their facial expressions. It's also part of what makes the audience feel like they've walked in on something they shouldn't; it's very intimate.
  • Failure Is the Only Option: Goal: to expose The Truth.
  • Fingertip Drug Analysis: Mulder, all... the... time.
  • First-Name Basis: Agent Doggett and Agent Reyes always call each other John and Monica, unless other agents are around. This likely comes from their time spent working together on the kidnapping and murder of Doggett's son years prior.
  • Fresh Clue: A couple times, a still-burning Morley cigarette left on the ground or in an office ashtray indicates that the Cigarette-Smoking Man has been there recently. Since he's The Chessmaster who's far from careless, he most likely deliberately left these there.
  • Friendship Moment: Many of these between Mulder and Scully. Pretty much any time either of them says "You're the only one I trust".
  • Friend to All Children: For someone who was portrayed as the typical Big Brother Bully and who only had rare occasions to interact with children during the series, Mulder is quite good with them.
  • From Camouflage to Criminal: A number of episodes featured disgruntled veterans from the Vietnam and Gulf wars who use their various abilities to seek revenge on military and political figures.
  • Geeky Turn-On
    Mulder: Looks like the fuselage of a plane.
    Scully: It's a North-American P-51 Mustang.
    Mulder: I just got very turned on.
  • Government Agency of Fiction: Much to everyone's chagrin and no one's surprise, there is no X-Files division of the FBI.
  • Government Conspiracy
  • The Greys: Played a major role in the Myth Arc.

    H-M 
  • Half-Human Hybrid: Alien/Human hybrids.
  • Headbutt of Love: Gently bumping their heads is Mulder and Scully's signature gesture of their mutual trust and support.
  • Healing Hands: Aliens have this ability, as well as several monsters of the week.
  • Held Gaze: Mulder and Scully are big on doing this.
  • Heroes Want Redheads: Mulder, obviously.
  • Hollywood Spelling: Constantly.
  • How We Got Here: Used several times for both Myth Arc and Monster of the Week episodes.
    • The monologues that bookend Season 10 recap nearly the entire series.
  • Idiosyncratic Episode Naming: The Myth Arc episodes (often two-parters or trilogies) sometimes used complementary names as "The End"/"The Beginning", "Two Fathers"/"One Son", "Biogenesis"/"The Sixth Extinction I & II" or "Within"/"Without". The standalone episodes' titles were often extremely vague words or phrases brought up by a single line of dialogue or some other subtle or insignificant aspect of the episode, sometimes in a foreign language. The show famously played a game with its fans who tried to find meaning in anything, no matter how obscure or insignificant it might appear, including the names of the episodes.
  • If Jesus, Then Aliens: Averted. Scully is Catholic and believes in miracles, but is a hardcore skeptic about all other paranormal phenomena; Mulder is agnostic and rather cynical about organized religion but believes in basically everything else. (It's implied at least once that God is deliberately hiding himself from Mulder's perception as a test of Scully's faith.)
  • Improbable Aiming Skills: Scully has them. Mulder...not so much.
  • Infant Immortality: Baby William, at every turn. The number of times that child should have died, before and after birth, are staggering. But not even a scratch.
  • Inverse Law of Fertility: Inverted — Scully doesn't seem particularly interested in having kids until she finds out her abduction left her infertile, at which point she decides she really wanted to become a mother...and then she inexplicably becomes pregnant.
  • Jerkass:
    • Agent Spender (though he had his sympathetic moments).
    • Assistant Director Brad Follmer.
    • Assistant Director Kersh is one until the Grand Finale, where he helps break Mulder out of prison.
  • Jerkass Has a Point: One of the things that made Kersh a formidable antagonist towards Mulder and Scully was that he quite accurately pointed out that their actions often flaunted FBI procedure and law.
  • Jurisdiction Friction: Present in the very first episode.
  • Lampshade Hanging: Whenever an episode recycled a plot previously seen in another show or movie, someone would typically point it out.
    • A particularly good one from the season six opener, when recapping what happened in Fight the Future:
    "Are you sure this isn't something I saw in Men in Black?"
  • Last-Name Basis
    • Mulder and Scully to each other. Mulder says he even made his parents call him Mulder, but it doesn't seem to have stuck. Mulder occasionally called Scully "Dana" at emotional moments in the first few seasons, then mostly gave it up, as if the last names had actually become more intimate by that point. Scully never even tried to call him Fox after the first time.
    • The Lone Gunmen are also known only by their last names, likely because two of them have Embarrassing First Names.
    • Most of the agents at the FBI go by last names; Skinner is always called by his last name even after becoming more of a friend than a superior to Mulder and Scully.
    • Averted by Reyes and Doggett, who refer to each other by first name on a regular basis.
  • Let X Be the Unknown
  • Light Is Not Good: The classic "aliens have floodlights all over the place" effect.
  • Lighter and Softer: Season 6, and most of the comedic episodes in general.
  • Living Emotional Crutch: Both Mulder and Scully become this to each other, verging on Heroic B.S.O.D. whenever they're involuntarily separated. This is portrayed as basically a good thing; their relationship ends up helping both of them overcome their personal issues to some degree.
  • Locked Room Mystery
  • London England Syndrome: All over the place.
  • Longing Look: Mulder and Scully had an astonishing talent for giving each other looks so singular, emotional and full of meaning they made anyone else in the room — or on the other side of the television screen — feel like they were intruding on some absurdly private moment.
  • Long-Runner Cast Turnover: By the time the series ended, only AD Skinner remained a main character. Mulder, Scully, and the Cigarette-Smoking Man were all demoted to regulars or extras.
  • Loved I Not Honor More: Subverted. Several times the show puts Mulder in what looks like a Friend or Idol Decision between saving Scully and his quest for the Truth — but ultimately it's strongly implied that the only reason he's able to achieve any success in his quest is because he has Scully as his partner.
  • MacGuffin Super Person: Baby William. He is described as "more human than human", a normal human child with none of the human frailties. He is seen as the salvation of the human race from alien invasion; he is the epitome of what the Syndicate has been trying to do for years: create a human/alien hybrid. While they did it in a lab (with diastrous results), William was gestated naturally. If they can figure out to replicate that, or make a vaccine against the alien virus, the human race has a chance of surviving. So, they're after him. And the Super Soldiers, who are bent on making sure alien invasion is swift and that resistance is futile, are after him to kill him. On top of that, he is kidnapped mid-season 9 by a UFO cult who are convinced he is connected to a UFO they found. He has supernatural powers, most notably telekinesis. He is seen making the mobile above his crib move on its own (scaring his mother to death in the process). He also has a Christ-like birth, with Scully giving birth in a shack in the middle of nowhere, a guiding star, and the Lone Gunmen acting as the Three Wise Men. Though it took place in mid-May, not December.
    • William factors heavily through the entire arc of the Season 10 revial.
  • The Man Behind the Man
  • Mayan Doomsday: December 21, 2012 was listed as the day the alien invasion was supposed to happen.
    • Reyes mentions 2012 as when the mechanizations began for pandemic that begins at the end of Season 10.
  • Maybe Ever After: The television series ends on this note for Mulder and Scully.
    • The second film confirms that they are in a relationship.
    • However, at the beginning of Season 10, they are still friendly, but are now estranged, and that Scully initiated it.
  • Meaningful Look: Mulder and Scully have many of these.
  • Meaningful Name: It's eventually revealed that the main alien antagonists call themselves the Purities. This should tell you everything you need to know about what they think of themselves... not to mention what they think about everybody else.
  • Medical Rape and Impregnate: It's strongly implied this happens to many victims of Alien Abduction. Including Scully. Mulder actually calls the conspirators "medical rapists" at one point.
    • In Season 10, the agents meet Sveta, who says she has been abducted and impregnated several times, with the fetuses taken from her before she is returned.
  • Men Don't Cry: Averted. Mulder is much more prone to openly showing emotion than Scully is.
  • The Men in Black
  • Missing Time: Comes up several times, most prominently happening to Mulder and Scully in the very first episode.
  • The Mole: A lot of these.
    • Krycek, for all of one episode before he's found out.
    • Marita Covarrubias, X's replacement.
    • Fowley
    • Section Chief Blevins.
    • Deep Throat is a Mole in the Syndicate.
    • Mulder originally thought Scully was a mole (and says so outright when he first meets her).
    • Reyes becomes a mole, reaching out to Scully when a planned pandemic is set into motion.
  • Monster of the Week: The modern Trope Codifier.
    • Subverted on a few occasions where the "monsters" are human, and during episodes where the Monster helps the agents in their case (or is otherwise non-violent).
  • Mother Nature, Father Science:
    • Inverted. Mulder is the emotional, intuitive one who believes in mysticism and the paranormal, while Scully is a stoic, logical scientist. (The inversion of conventional gender roles was quite deliberate on the part of the writers.)
    • Played jarringly straight in the few episodes where the Monster of the Week is a religious icon that Scully believes and Mulder doubts.
    • Played straight in seasons 9 with Doggett and Reyes, as they were meant to replicate (but not duplicate) the believer/skeptic relationship of their predecessors.
    • In season 8, with Doggett being the non-emotional, straight-laced former cop and Scully being the believer, it's played straight. Even though she's not as skeptical as she was when she joined the X-Files, Scully is still Scully. She's still the logical scientist, and though she admits she's seen things she can't ignore, she's not the believer. However, to keep the office running (and to keep Doggett from dismissing the work outright), she is forced to take on Mulder's role in his absence. In some of the episodes, you can tell she's suggesting things she absolutely does not believe in, but entertains them because the cases are X-Files. It's mentioned at least once that she finds it hard to "be Mulder," not only because she's never been the believer in the relationship, but because she is unable to make the insane leaps of logic Mulder was infamous for.
  • The Mountains of Illinois: What happens when you film in Vancouver (and later Los Angeles) but set your stories all over the US, even the flat bits.
  • The Movie: Two of them. The first one is part of the show's Myth Arc, the second is basically a long Monster of the Week episode.
  • My Biological Clock Is Ticking: Scully's abduction left her infertile (somewhat ironic, considering her abduction was written in to allow Gillian Anderson to go on maternity leave). It's a source of angst for her. It's played much more subtly — and with good reason; he'd never be enough of a jerkass to actually bring it up, considering Scully's infertility — but Mulder is implied to be somewhat wistful about not being in a position to have kids too.
  • Multi-Part Episode: There are almost as many multi-part episodes of the show as there are stand alone. Most of the mythology episodes ended up being multi-parters though they were rarely named as such.
  • Mystical Pregnancy: At least two, despite the first one having supposedly rendered her infertile.
  • Mysterious Informant: Several. Deep Throat, X, and Marita are the three main recurring ones.
    • An unnamed doctor present at the Rosewell crash site in 1947 appears to been in contact with Mulder since the X-Files were closed.

    N-T 
  • No Hugging, No Kissing: The show was famous for this early on, but even then it was oddly subverted in a few instances, and by around season 6 Mulder and Scully had really become awfully, uh, cuddly for platonic friends.
  • No Sense of Personal Space: Mulder in regards to Scully, as well as being quite affectionate. She is definitely unnerved by it in the early seasons, but eventually gets used to it.
  • Noodle Incident: In season 2, it's revealed that Scully has a key to Mulder's apartment. How this came about is never discussed. It's not known whether Mulder has a key to her apartment.
  • Not Love Interest: While it took them seven seasons to get around to making it official, for all intents and purposes Mulder and Scully were best friends/lovers/spouses since day one. It could even be argued that their bond transcended all three of those roles to become something more all-encompassing than most people ever experience. It certainly cannot be denied that they were the most important people in each others' lives almost since the first time Scully walked into Mulder's basement office.
  • Not of This Earth: The mysterious bacteria and virus, first appearing in "The Erlenmeyer Flask".
    Dr. Carpenter: A fifth and sixth DNA nucleotide. A new base pair. Agent Scully, what are you looking at... it exists nowhere in nature. It would have to be, by definition... extraterrestrial.
  • Not Quite Dead:
    • Mulder on more than one occasion.
    • Krycek, many times.
    • The Cigarette-Smoking Man in season 5 and again in season 7.
      • And we find he survived the airstike on his position at the end of Season 9.
    • Jeffrey Spender, presumed dead in season six, but seen again in season nine.
  • Obstructive Bureaucrat: Practically everyone else in the FBI except for Skinner. In particular, Kersh and Follmer.
  • Occult Detective: Mulder and Scully investigate the paranormal.
  • Odd Couple
  • Omniscient Council of Vagueness: The mysterious and shady group called "Syndicate" effectively controls the world with various conspiracies.
  • One Steve Limit: Averted — there are at least four fairly important characters named William, three of whom go by the nickname Bill: Mulder's father, Scully's father, Scully's older brother, and Baby William. And it's Mulder's middle name.
  • The Only One I Trust: Mulder and Scully towards each other. No wonder they provide the page quote.
  • Orifice Invasion: Very common, most memorably in the form of the Black Oil.
  • Our Cryptids Are More Mysterious: So many examples that the show may actually have started some cryptid legends.
  • Our Hero Is Dead: Killing Mulder at the end of the season becomes almost traditional.
  • Our Monsters Are Different: Well, most of the time.
  • Paranormal Investigation
  • Platonic Life Partners: Mulder and Scully for the first five seasons.
  • Police Are Useless: Zigzagged. Mulder and Scully are themselves police and extremely competent, hence an aversion. Other cops, be they local police or other FBI agents, can be all over the place: genuinely helpful, well-meaning but ineffectual, obstructive bureaucrats or in cahoots with the Syndicate/Monster of the Week.
  • Politically Incorrect Villain: The Consortium as a whole. The upper levels seem to be composed entirely of older, upper-class white men. They also consistently failed to realize it was Mulder and Scully as partners, not Mulder individually, who might pose a threat to their plans, thinking of Scully only as Mulder's Berserk Button when they could be bothered to notice her existence at all.
  • Porn Stash: It's a recurring joke that Mulder has one. Unusually for the trope, he makes no real attempt to keep it secret, and Scully doesn't seem to care beyond thinking it's kind of silly.
    Mulder: Whatever tape you found in that VCR? It isn't mine.
    Scully: Don't worry, I put it in the drawer with all the other videos that aren't yours.
  • Power of Trust: "Trust no one" is a major catch phrase in the show, but it's subtly ironic — one of the show's main themes is actually the importance, in a world of lies and conspiracies, of having someone you can trust absolutely. Mulder and Scully spend so much time saying things like "You're the only one I trust," it became a common fandom joke that they were just using "trust" as a code word for "love".
  • Powers That Be
  • Properly Paranoid: Practically the entire cast displays this behavior at some point. Yes, the Conspiracy really is out to get them. So much so that everyone largely stops caring after a while. What Suzanne Modeski tells the Lone Gunmen could be the series' motto: "No matter how paranoid you are, you're not paranoid enough." This might however take paranoia to the point of kitsch.
  • Purely Aesthetic Glasses: Both Mulder and Scully are seen wearing reading glasses occasionally in the early seasons.
  • Reassigned to Antarctica: Mulder in season 2 after the X-Files were shut down, and both Mulder and Scully in season 6 when Fowley and Spender replaced them.
  • Reassignment Backfire: Scully was pulled out of being a professor at Quantico to debunk Mulder's work on the X-Files. She is unable to do it and starts siding with him.
  • Red Herring: Red Herrings were used on the Myth Arc level as well in some standalone episodes. Several clues that appeared to be important to the mysteries the agents Mulder and Scully were supposed to unravel ultimately lead nowhere, or were not simply addressed again.
    • The fate of Samantha Mulder was probably the biggest Red Herring of the series. Her abduction was a defining moment of Mulder's life as it triggered his belief in the paranormal and motivated his career at the FBI. Throughout the series, Mulder was tormented by her clones and reassurances that she's still alive. However, it was revealed that she had been abducted by the conspiracy who had collaborated with the aliens. She was saved by some strange kind of fairies or angels which made her body disappear, meaning that her corpse will never be found, but Mulder did see her ghost.
  • Rewind, Replay, Repeat: Happens frequently, usually when Mulder catches a glimpse of something in the footage that everyone else overlooked.
  • Roswell That Ends Well
  • Say My Name: The two leads do this an awful lot.
  • Science Hero: Both of them, but moreso Scully than Mulder.
  • Serial Killer: Several times. Most of them are really horrifying.
  • Shapeshifting: The Alien Bounty Hunters and several monsters of the week.
  • Sherlock Scan: Mulder does this sometimes, being able to tell that the person he's interviewing happens to BE the monster of the week. It's often forgotten that Mulder acquired his reputation of "Spooky Mulder" from way before he got involved with the paranormal. Supposedly, his skill at quickly building detailed profiles was so good that people felt that it was "spooky", to the point that he had attracted the attention of senior FBI agents when he was still a cadet. However, after repeatedly getting dismissed for his outlandish theories he became less and less forthcoming with them unless it's to Scully, who feverishly does everything she can to debunk him.
  • Ship Tease:
    • A lot for Scully and Mulder, although they were mostly relatively restrained about it until around season 6.
    • The writers were also very aware of other shippers in the fandom, including the slash fans, and enjoyed throwing out occasional bones for the Scully×Skinner, Mulder×Skinner, and Mulder×Krycek crowds.
  • Shirtless Scene: Mulder was shirtless fairly often.
  • Shout-Out: Enough with it's own sub-page. And it's looong.

    U-Z 
  • "Uh-Oh" Eyes: The monsters' eyes sometimes indicated the level of their evil.
  • Ultraterrestrials: A key part of the Myth Arcthe "aliens" are actually Earth's original native inhabitants, who've returned from a leave of absence.
  • Undying Loyalty: Mulder and Scully's loyalty to each other transcends time, space and apparent death, among other things.
  • Unguided Lab Tour: Comes up a couple times, though they usually aren't so much secret labs as academic or government labs doing secret things.
  • The Un-Reveal
  • Unresolved Sexual Tension: Guess who? (The term actually originated in online X-Files fandom.)
  • The Virus: Turned Up to Eleven at the end of Season 10.
  • Voluntary Shapeshifting: Various baddies, but the most prominent example is the Alien Bounty Hunter, a recurring antagonist. He's an extraterrestrial assassin, and can look like anyone.
  • Wait Here: Any time Mulder drops one of these on Scully, you can rest assured that the Monster of the Week or other paranormal phenomenon is about to make an appearance and poor Mulder will have nobody around to verify his account. It doesn't always result in one of them being taken hostage but often does.
  • We Have Been Researching Phlebotinum for Years: At various points throughout the Myth Arc.
  • Well-Intentioned Extremist: The Syndicate.
  • Wham Episode: The show was quite fond of these.
  • Why Don't You Just Shoot Him?: Even disregarding the rather questionable justification for the bad guys not simply offing Mulder as they've done with so many other people (that Mulder would become a martyr), they don't even seem to try to discredit him that much.
  • Who's Your Daddy?: A major plot point in season 8.
  • World of Snark: Everyone is a Deadpan Snarker, specially Mulder, Scully and Skinner.
  • Written-In Absence: Scully's abduction — an event that would go on to shape the entire Myth Arc, as well as Mulder and Scully's relationship and Character Development throughout the rest of the show — was written in simply to get Gillian Anderson out of the way while she was heavily pregnant in Real Life.
  • "X" Makes Anything Cool
    • "The X-Files" sound way better than "the U-Files". They might have been called that for "unsolved" but weren't thanks to the filing system at the FBI in the 50's.
    Clerk Bahnsen: It's in an X-file.
    Agent Dales: An "X-file"?
    Clerk Bahnsen: Yes, unsolved cases. I file them under "X".
    Agent Dales: Why don't you file them under "U" for "unsolved"?
    Clerk Bahnsen: That's what I did until I ran out of room. Plenty of room in the "X"s.

Trust no one.
http://tvtropes.org/pmwiki/pmwiki.php/Series/TheXFiles?from=Series.TheX-Files